One of two things, you have hashimotos thyroiditis, or you acquired the antibodies for graves/hyper along the way. Since you were diagnosed with hypothyroid its most likely you're going through a hyper phase, which is common in HT as ones body attacks thyroid cells/tissue and they end up spilling hormone causing one to go hyper. Sorry, that's the best way I can explain it. You need to request a TPO TSI and ATG antibody test to determine if this is autoimmune related.
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